strlcpy.S revision 1.3.8.2
1 1.3.8.2 martin /* $NetBSD: strlcpy.S,v 1.3.8.2 2008/04/28 20:22:57 martin Exp $ */ 2 1.3.8.2 martin 3 1.3.8.2 martin /* 4 1.3.8.2 martin * Copyright (c) 2002 The NetBSD Foundation, Inc. 5 1.3.8.2 martin * All rights reserved. 6 1.3.8.2 martin * 7 1.3.8.2 martin * This code is derived from software contributed to The NetBSD Foundation 8 1.3.8.2 martin * by Matthew Fredette. 9 1.3.8.2 martin * 10 1.3.8.2 martin * Redistribution and use in source and binary forms, with or without 11 1.3.8.2 martin * modification, are permitted provided that the following conditions 12 1.3.8.2 martin * are met: 13 1.3.8.2 martin * 1. Redistributions of source code must retain the above copyright 14 1.3.8.2 martin * notice, this list of conditions and the following disclaimer. 15 1.3.8.2 martin * 2. Redistributions in binary form must reproduce the above copyright 16 1.3.8.2 martin * notice, this list of conditions and the following disclaimer in the 17 1.3.8.2 martin * documentation and/or other materials provided with the distribution. 18 1.3.8.2 martin * 19 1.3.8.2 martin * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.3.8.2 martin * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.3.8.2 martin * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.3.8.2 martin * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.3.8.2 martin * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.3.8.2 martin * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.3.8.2 martin * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.3.8.2 martin * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.3.8.2 martin * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.3.8.2 martin * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.3.8.2 martin * POSSIBILITY OF SUCH DAMAGE. 30 1.3.8.2 martin */ 31 1.3.8.2 martin 32 1.3.8.2 martin #include <machine/asm.h> 33 1.3.8.2 martin 34 1.3.8.2 martin #if defined(LIBC_SCCS) && !defined(lint) 35 1.3.8.2 martin RCSID("$NetBSD: strlcpy.S,v 1.3.8.2 2008/04/28 20:22:57 martin Exp $") 36 1.3.8.2 martin #endif /* LIBC_SCCS and not lint */ 37 1.3.8.2 martin 38 1.3.8.2 martin /* 39 1.3.8.2 martin * size_t strlcpy(char *dst, const char *src, size_t size); 40 1.3.8.2 martin */ 41 1.3.8.2 martin LEAF_ENTRY(_strlcpy) 42 1.3.8.2 martin .weak strlcpy 43 1.3.8.2 martin strlcpy = _strlcpy 44 1.3.8.2 martin 45 1.3.8.2 martin /* Always load the first byte of the source string. */ 46 1.3.8.2 martin ldbs,ma 1(%arg1), %r1 47 1.3.8.2 martin 48 1.3.8.2 martin /* 49 1.3.8.2 martin * If our dst buffer is zero bytes, branch immediately 50 1.3.8.2 martin * to the code that counts the (remaining) length 51 1.3.8.2 martin * of the src string. 52 1.3.8.2 martin */ 53 1.3.8.2 martin comb,= %r0, %arg2, $strlcpy_dst_done 54 1.3.8.2 martin copy %arg1, %ret0 55 1.3.8.2 martin 56 1.3.8.2 martin /* 57 1.3.8.2 martin * If our dst buffer is one byte, branch immediately 58 1.3.8.2 martin * to the code that NUL-terminates the dst buffer and 59 1.3.8.2 martin * counts the (remaining) length of the src string. 60 1.3.8.2 martin */ 61 1.3.8.2 martin addib,=,n -1, %arg2, $strlcpy_dst_full 62 1.3.8.2 martin 63 1.3.8.2 martin /* 64 1.3.8.2 martin * Loop copying bytes. At the top of this loop, 65 1.3.8.2 martin * %arg2 is always the number of bytes we can still 66 1.3.8.2 martin * store, and %r1 holds the next byte to store. 67 1.3.8.2 martin */ 68 1.3.8.2 martin $strlcpy_loop: 69 1.3.8.2 martin comb,= %r0, %r1, $strlcpy_exit 70 1.3.8.2 martin stbs,ma %r1, 1(%arg0) 71 1.3.8.2 martin addib,<> -1, %arg2, $strlcpy_loop 72 1.3.8.2 martin ldbs,ma 1(%arg1), %r1 73 1.3.8.2 martin 74 1.3.8.2 martin $strlcpy_dst_full: 75 1.3.8.2 martin stbs,ma %r0, 1(%arg0) 76 1.3.8.2 martin 77 1.3.8.2 martin $strlcpy_dst_done: 78 1.3.8.2 martin comb,<>,n %r0, %r1, $strlcpy_dst_done 79 1.3.8.2 martin ldbs,ma 1(%arg1), %r1 80 1.3.8.2 martin 81 1.3.8.2 martin $strlcpy_exit: 82 1.3.8.2 martin bv %r0(%rp) 83 1.3.8.2 martin sub %arg1, %ret0, %ret0 84 1.3.8.2 martin EXIT(strlcpy) 85
Indexes created Mon Sep 29 21:09:56 GMT 2025